Mark Ranft ([log in to unmask]) wrote:
: In response to numerous user requests HP changed the disc allocation
mechanism in MPE/iX Release
: 5.0.  The intent was to keep from fragmenting the disc space on LDev 1.
: Last week I discovered that new algorithm does not work on systems that have
less than four(4)
: members(discs) on the MPEXL_SYSTEM_VOLUME_SET.  In this case, LDev 1 is
almost never used for
: file allocation.  This includes virtual memory, permanent file space as well
as spoolfiles.
<stuff deleted>
: This opportunity is reported in SR# 5003 268938.
<stuff deleted>
: To determine if the new algorithm is affecting you, use "DISCFREE C" and look
at LDev 1
: allocation (virtual memory allocation is a sure indicator.)  Mine looks like
this...
: LDEV :     1 -- (MPEXL_SYSTEM_VOLUME_SET:MEMBER1)
:  Device    |    5294144        |    3229856 ( 61%) |    2064288 ( 39%) |
:  Permanent |    3970608 ( 75%) |    3122096 ( 59%) |     848512 ( 16%) |
:  Transient |    3970608 ( 75%) |     107760 (  2%) |    2064288 ( 39%) |
: LDEV :     2 -- (MPEXL_SYSTEM_VOLUME_SET:MEMBER2)
:  Device    |    5294144        |    3387168 ( 64%) |    1906976 ( 36%) |
:  Permanent |    5294144 (100%) |    2164928 ( 41%) |    1906976 ( 36%) |
:  Transient |    5294144 (100%) |    1222240 ( 23%) |    1906976 ( 36%) |
 
: Note how only 2% of LDev 1 is being used for Transient (Virtual Memory).
--
I've been bitten by this problem also.  The Volutil CONTIGVOL command
can be used carefully to balence the permanent disc usage (use the time
limiting option) or third party disc management tools.
 
But your limits of 75% for perm and trans are part of your problem.  I
use 100% for trans on all MPE...Set discs.  Also, for the larger discs
more than 75% perm can be used.  I think 90% is available on your ledv 1.
Generally, I configure my Ldev 1 Perm at 2 to 3 % less than the max allowed
so that If I get in total disc space trouble I can quickly make that
"spare space" available via VOLutil.
 
Also, check for disc fragmentation with Discfree a.  That can explain
partly why transient goes to a disc other than Ldev 1 sometimes.
 
James Overman HP Support Technology Lab  Roseville, CA